下面关于舌簧的描述错误的是()。
A.用0.5mm不锈钢丝弯制
B.舌簧平面与牙体长轴垂直
C.舌簧各曲应圆滑
D.加力时,使牙齿唇颊向移动
E.舌簧的后段为前段的1/3
参考答案:E
The children vary considerably in the rate at which they learn these lessons. ____, we make the teaching
plans different accordingly. [ ]
A. Because of this reason
B. It is because
C. As a result of
D. For this reason
数据库系统的核心是( )。
A.数据模型
B.数据库管理系统
C.数据库
D.数据库管理员